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Physiol. Genomics 15: 223-227, 2003. First published September 9, 2003; doi:10.1152/physiolgenomics.00095.2003
1094-8341/03 $5.00
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Received 10 June 2003; accepted in final form 3 September 2003.
Physiological Genomics 15:223-227 (2003)
1094-8341/03 $5.00 © 2003 American Physiological Society

Disease genes and intracellular protein networks

S. Bortoluzzi1, C. Romualdi2, A. Bisognin1 and G. A. Danieli1

1 Department of Biology
2 Ricerche Interdipartimentale Biotecnologie Innovative (CRIBI), University of Padua, Padua I-35131, Italy

By a computational approach we reconstructed genomic transcriptional profiles of 19 different adult human tissues, based on information on activity of 27,924 genes obtained from unbiased UniGene cDNA libraries. In each considered tissue, a small number of genes resulted highly expressed or "tissue specific." Distribution of gene expression levels in a tissue appears to follow a power law, thus suggesting a correspondence between transcriptional profile and "scale-free" topology of protein networks. The expression of 737 genes involved in Mendelian diseases was analyzed, compared with a large reference set of known human genes. Disease genes resulted significantly more expressed than expected. The possible correspondence of their products to important nodes of intracellular protein network is suggested. Auto-organization of the protein network, its stability in time in the differentiated state, and relationships with the degree of genetic variability at genome level are discussed.

gene expression; protein network; Mendelian disease




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